Printing machine and ejection control method for the same

Abstract

Disclosed is a printing machine comprising: encoders (and) configured to detect respective angular velocities of a drive roller and a driven roller as a travel speed of core members inside a transfer belt (); a DSP () configured to extract from a temporal variation in a ratio of the measured speed at each roller speed ratio data (profile data) having a frequency corresponding to the speed ratio of a core portion; profile data memory () configured to store the profile data; and a head controller () configured to control the timing at which each image is formed by a head unit () on the basis of the profile data so that positional deviation among multiple images on the transfer belt () may be reduced. The head unit () forms multiple images on a record medium under the control of the head controller (). Thus, an ink misalignment at the time of printing can be prevented with high accuracy by recording a change in the core members inside the belt as a profile, using this profile, and reducing memory usage and arithmetic processing load.